Being ‘polite’ is too much for this small “c” Christian.

A belief that results in intolerant behavior doesn’t qualify as a ‘religious’ belief. Aggression isn’t protected. Belive what you wish, it is not your ‘belief’ being regulated, it is your actions. Here intentional mal-treatment [or even merely rude treatment] has no place in the classroom. What does it harm you to call people the way they wish to be called. People who hear ‘voices’ like “speaking with God for instructions” can’t be sure, since these are unverifiable, cannot be allowed to act in ways harmful to those they are in a trust relationship with. And since God isn’t here to be punished the messenger/actor is the only one available.